Compile in flockfile and friends by default

 -Erik

libc/stdio/Makefile

@@ -54,7 +54,7 @@ MOBJ = fclose.o fflush.o fopen.o freopen.o perror.o remove.o \
 	__fbufsize.o __freading.o __fwriting.o __freadable.o __fwritable.o \
 	__flbf.o __fpurge.o __fpending.o _flushlbf.o \
 	 fopencookie.o fmemopen.o open_memstream.o \
-	__fsetlocking.o \
+	__fsetlocking.o flockfile.o ftrylockfile.o funlockfile.o \
 	_stdio_fopen.o _stdio_fread.o _stdio_fwrite.o _stdio_adjpos.o \
 	_stdio_lseek.o _stdio_init.o \
 	_stdio_fsfopen.o _stdio_fdout.o _uintmaxtostr.o

libc/stdio/stdio.c

@@ -1007,7 +1007,9 @@ int __fsetlocking(FILE *stream, int locking_mode)
 
 void flockfile(FILE *stream)
 {
+#ifdef __STDIO_THREADSAFE
 	pthread_mutex_lock(&stream->lock);
+#endif
 }
 
 #endif
@@ -1016,7 +1018,11 @@ void flockfile(FILE *stream)
 
 int ftrylockfile(FILE *stream)
 {
+#ifdef __STDIO_THREADSAFE
 	return pthread_mutex_trylock(&stream->lock);
+#else
+	return 1;
+#endif
 }
 
 #endif
@@ -1025,7 +1031,9 @@ int ftrylockfile(FILE *stream)
 
 void funlockfile(FILE *stream)
 {
+#ifdef __STDIO_THREADSAFE
 	pthread_mutex_unlock(&stream->lock);
+#endif
 }
 
 #endif